The following was posted on the DropDMG blog:
Version 3.4.2 of DropDMG is now available. This is a free update for owners of DropDMG 3.0 that includes the following enhancements:
- Removed support for creating .xip archives because macOS 10.12 can no longer expand .xip files not created by Apple. DropDMG will change configurations using .xip to .zip. Going forward, Apple recommends using signed .dmg files.
- Renamed “Mac OS X” to “macOS” throughout the app and documentation.
- Updated to Xcode 8.
- Added the Sending in Crash Log Files section of the manual.
- Updated the Spanish localization.
DropDMG 3.4.2 works with Mac OS X 10.6.8 through macOS 10.12. Older versions are available for older operating systems. For information about previous releases of DropDMG, please see the version history.